一个空指针异常,代码如下，打了断点，一到“TOPICID”那里（在下方注释4那里）就抛异常

Question

  /**导出到excel
     * @param
     * @throws Exception
     */
    @RequestMapping(value="/excel")
    public ModelAndView exportExcel() throws Exception{
        logBefore(logger, Jurisdiction.getUsername()+"导出Entity到excel");
        if(!Jurisdiction.buttonJurisdiction(menuUrl, "cha")){return null;}
        ModelAndView mv = new ModelAndView();
        PageData pd = new PageData();
        pd = this.getPageData();
        Map<String,Object> dataMap = new HashMap<String,Object>();
        List<String> titles = new ArrayList<String>();
        titles.add("表内id"); //1
        titles.add("姓名");   //2
        titles.add("实体类型"); //3
        titles.add("topicid");  //4
        titles.add("评论");   //5  varOList.get(i).get("TOPICID") 返回值判一下空.
//      titles.add("0/1,1:已删"); //6
        dataMap.put("titles", titles);
        List<PageData> varOList = entityService.listAll(pd);
        List<PageData> varList = new ArrayList<PageData>();
        for(int i=0;i<varOList.size();i++){
            PageData vpd = new PageData();
            vpd.put("var1", varOList.get(i).get("ID").toString());  //1
            vpd.put("var2", varOList.get(i).getString("NAME")); //2
            vpd.put("var3", varOList.get(i).getString("ENTITYTYPE"));   //3
            vpd.put("var4", varOList.get(i).get("TOPICID").toString()); //4
            vpd.put("var5", varOList.get(i).getString("COMMENTS")); //5
//          vpd.put("var6", varOList.get(i).getString("DEL"));  //6
            varList.add(vpd);
        }
        dataMap.put("varList", varList);
        ObjectExcelView erv = new ObjectExcelView();
        mv = new ModelAndView(erv,dataMap);
        return mv;
    }

Answer 1

把你的异常的信息贴出来看看。